Understanding Intersections and Differences : Intersect « Set « Oracle PL/SQL Tutorial

Oracle PL/SQL Tutorial
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Oracle PL/SQL Tutorial » Set » Intersect 
3. 2. 3. Understanding Intersections and Differences
SQL>
SQL> CREATE TABLE empExam (
  2     empID  INT NOT NULL,
  3     ExamID     INT NOT NULL,
  4     Mark       INT,
  5     Taken   SMALLINT,
  6     Comments   VARCHAR(255),
  7     CONSTRAINT PK_empExam PRIMARY KEY (empID, ExamID));

Table created.

SQL>
SQL>
SQL> INSERT INTO empExam (empID,ExamID,Mark,Taken,CommentsVALUES (1,1,55,1,'Satisfactory');

row created.

SQL> INSERT INTO empExam (empID,ExamID,Mark,Taken,CommentsVALUES (1,2,73,1,'Good result');

row created.

SQL> INSERT INTO empExam (empID,ExamID,Mark,Taken,CommentsVALUES (2,3,44,1,'Hard');

row created.

SQL> INSERT INTO empExam (empID,ExamID,Mark,Taken,CommentsVALUES (2,5,39,0,'Simple');

row created.

SQL> INSERT INTO empExam (empID,ExamID,Mark,TakenVALUES (2,6,63,1);

row created.

SQL>
SQL>
SQL>
SQL> CREATE TABLE dept (
  2     deptID INT NOT NULL PRIMARY KEY,
  3     empID    INT NOT NULL,
  4     ClassID      INT NOT NULL,
  5     EnrolledOn   DATE,
  6     Grade        INT);

Table created.

SQL>
SQL> INSERT INTO dept (deptID,empID,ClassID,EnrolledOn,GradeVALUES (1,1,1,DATE '2002-09-23',62);

row created.

SQL> INSERT INTO dept (deptID,empID,ClassID,EnrolledOn,GradeVALUES (2,1,2,DATE '2002-09-30',70);

row created.

SQL> INSERT INTO dept (deptID,empID,ClassID,EnrolledOn,GradeVALUES (3,2,3,DATE '2003-09-23',51);

row created.

SQL> INSERT INTO dept (deptID,empID,ClassID,EnrolledOn,GradeVALUES (4,2,5,DATE '2003-09-23',41);

row created.

SQL> INSERT INTO dept (deptID,empID,ClassID,EnrolledOn,GradeVALUES (5,2,6,DATE '2003-09-23',68);

row created.

SQL> INSERT INTO dept (deptID,empID,ClassID,EnrolledOn,GradeVALUES (6,3,4,DATE '2002-09-30',78);

row created.

SQL> INSERT INTO dept (deptID,empID,ClassID,EnrolledOn,GradeVALUES (7,3,7,DATE '2002-09-30',80);

row created.

SQL> INSERT INTO dept (deptID,empID,ClassID,EnrolledOn,GradeVALUES (8,4,8,DATE '2002-09-20',70);

row created.

SQL>
SQL>
SQL> SELECT empID
  2     FROM empExam
  3     WHERE Mark < 40
  4  MINUS
  5  SELECT empID
  6     FROM dept
  7     WHERE GRADE > 69
  8  ORDER BY empID;

     EMPID
----------
         2

row selected.

SQL>
SQL>
SQL> drop table empExam;

Table dropped.

SQL> drop table dept;

Table dropped.
3. 2. Intersect
3. 2. 1. Using the INTERSECT Operator
3. 2. 2. Intersect two select statements
3. 2. 3. Understanding Intersections and Differences
3. 2. 4. INTERSECT date column
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